Abstract
An apparatus designed for elemental trace analysis using neutron-capture gamma radiation is described. An optimized collimator and filter system yields a high thermal-neutron flux while maintaining low fast-neutron and gamma-ray levels at the sample. The shield for the NaI(Tl) scintillation detector is designed to give maximum counting geometry commensurate with adequate background attenuation. Interfering radiation from the sample is subtracted from the capture gamma-ray spectra during irradiation by modulating the neutron beam with a high resolution chopper and gating the logic unit of the multichannel analyzer in phase with the neutron bursts. The method is applied to the analysis of boron and cadmium.
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